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Loans - Recorded Investment by Loan Grade (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 5,372,483 | $ 5,271,857 | $ 5,068,085
Five Rated [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 17,272 | 5,826 |
Five Rated [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 5,322 | 7,548 |
Five Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 278 | 287 |
Five Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 216 | 1,055 |
Five Rated [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 23,088 | 14,716 |
Six Rated [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 153 |  |
Six Rated [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 457 | 190 |
Six Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans |  | 118 |
Six Rated [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1 | 124 |
Six Rated [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 611 | 432 |
Impaired [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 18,064 | 20,657 |
Impaired [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 18,142 | 24,474 |
Impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,324 | 2,226 |
Impaired [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 19,059 | 23,102 |
Impaired [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 56,589 | 70,459 |
Pass [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,022,377 | 971,694 |
Pass [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,147,969 | 1,127,652 |
Pass [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 124,188 | 133,110 |
Pass [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 374,847 | 383,346 |
Pass [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,029 | 3,272 |
Pass [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 2,672,410 | 2,619,074 |
Recorded Investment [Member] | Commercial, financial and agricultural |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,057,866 | 998,177 |
Recorded Investment [Member] | Commercial real estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 1,171,890 | 1,159,864 |
Recorded Investment [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 125,790 | 135,741 |
Recorded Investment [Member] | Commercial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 394,123 | 407,627 |
Recorded Investment [Member] | Leases |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | 3,029 | 3,272 |
Recorded Investment [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Total loans | $ 2,752,698 | $ 2,704,681 |

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